Structural, magnetic, and transport properties of the single-layered perovskites La{sub 2-x}Sr{sub x}CoO{sub 4} (x=1.0-1.4)
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Faculty of Nuclear Sciences and Physical Engineering CTU Prague, Brehova 7, 115 19 Prague 1 (Czech Republic)
- Institute of Physics of ASCR, Cukrovarnicka 10, 162 53 Prague 6 (Czech Republic)
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna Moscow Region (Russian Federation)
The layered cobaltites La{sub 2-x}Sr{sub x}CoO{sub 4} have been complexly studied over the range of mixed Co{sup 3+/4+} valency and their properties discussed in comparison with cubic perovskites La{sub 1-x}Sr{sub x}CoO{sub 3}. The sample x=1.0 exhibits a paramagnetic ground state based on the intermediate spin state of Co{sup 3+} and undergoes a broad resistivity transition at 400-900 K, associated with diffusive changes of magnetic susceptibility and volume expansion. The Co{sup 4+} doping in samples with x>1 induces gradually ferromagnetism and leads to a dramatic decrease of resistivity and thermopower, though the metallicity is not achieved. The neutron diffraction on the limit composition x=1.4 suggests that the long-range ordered ferromagnetic regions coexist with paramagnetic ones, and their amount changes little with an application of high pressures up to 4.3 GPa.
- OSTI ID:
- 20853740
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 13 Vol. 74; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COBALT IONS
COBALT OXIDES
COMPARATIVE EVALUATIONS
CONCENTRATION RATIO
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
FERROMAGNETIC MATERIALS
FERROMAGNETISM
GROUND STATES
LANTHANUM COMPOUNDS
MAGNETIC SUSCEPTIBILITY
NEUTRON DIFFRACTION
PARAMAGNETISM
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SPIN
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
VALENCE
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COBALT IONS
COBALT OXIDES
COMPARATIVE EVALUATIONS
CONCENTRATION RATIO
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
FERROMAGNETIC MATERIALS
FERROMAGNETISM
GROUND STATES
LANTHANUM COMPOUNDS
MAGNETIC SUSCEPTIBILITY
NEUTRON DIFFRACTION
PARAMAGNETISM
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SPIN
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
VALENCE